Abstract
Field experiments were undertaken during kharif 2012 and 2013 under irrigated ecosystem to evaluate the efficacy of botanicals along with standard fungicides for assessing per cent disease incidence, plant height, number of tiller per plant, number of spikelet per panicle, panicle length, 100-grain weight and grain yield against blast of rice. Pooled data of two years suggest that neem based commercial biopesticides with azadiractin as active ingredients were found effective in reducing disease severity and improving the yield attribute of the crop and proves promising products when compared to standard fungicides. Among the botanicals the spraying of Achook, Neem Azal T/S, Neem gold and Tricure shows significant reduction in disease severity, along with improving yield attributes, increasing the 100-grain weight and grain yield.
Highlights
One of the major diseases of rice namely rice blast is caused by Pyricularia oryzae Cav. (Magnaporthe grisea Sacc.) is an important and serious disease to rice worldwide [1, 2]
From the foregoing result it was observed that the botanicals with azadiractin as active ingredients were proved impressive when compared to standard fungicides in reducing disease severity and improving the yield attribute
Achook was found significantly effective in managing the leaf blast (20.2%) closely followed by Neem Azal T/S (20.4%) and Neem gold
Summary
One of the major diseases of rice namely rice blast is caused by Pyricularia oryzae Cav. (Magnaporthe grisea Sacc.) is an important and serious disease to rice worldwide [1, 2]. The pathogen, a holomorph of a complex of heterothallic Ascomycetes, is most damaging of rice diseases [3]. It causes high yield loss about 30% globally [4], and major threat to global food security [5]. In India, rice blast is a major production constraint in irrigated ecosystem [6] and under severe epiphytic conditions may result a loss of 70–90% [7]. In central India the blast diseases cause significant loss in yield in traditional as well as improved varieties. The scented rice Basmati with a wide popularity among the growers has even no resistance to diseases [8] and shows high level of susceptibility under conducive weather conditions [9]
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